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Glossary
S (Continued)
SMT (802.11)
SNMP
SNMP trap
SSH
SSID
230
Station ManagemenT. The object class in the 802.11 MIB that provides
the necessary support at the station to manage the processes in the
station such that the station may work cooperatively as a part of an
IEEE 802.11 network. The four branches of the 802.11 MIB are:
> dot11smt - objects related to station management and local
configuration
> dot11mac - objects that report/configure on the status of various
MAC parameters
> dot11res - Objects that describe available resources
> dot11phy - Objects that report on various physical items.
Simple Network Management Protocol. A set of protocols for
managing complex networks. SNMP works by sending messages,
called protocol data units (PDUs), to different parts of a network.
SNMP-compliant devices, called agents, store data about themselves
in Management Information Bases (MIBs) and return this data to the
SNMP requesters.
SNMP includes a limited set of management commands and
responses. The management system issues Get, GetNext and Set
messages to retrieve single or multiple object variables or to establish
the value of a single variable. The managed agent sends a Response
message to complete the Get, GetNext or Set.
An event notification sent by the SNMP managed agent to the
management system to identify the occurrence of conditions (such as a
threshold that exceeds a predetermined value).
Secure Shell, sometimes known as Secure Socket Shell, is a Unix-based
command interface and protocol for securely getting access to a
remote computer. SSH is a suite of three utilities - slogin, ssh, and scp
- secure versions of the earlier UNIX utilities, rlogin, rsh, and rcp.
With SSH commands, both ends of the client/server connection are
authenticated using a digital certificate, and passwords are protected
by being encrypted.
Service Set Identifier. A 32-character unique identifier attached to the
header of packets sent over a Wireless LAN that acts as a password
when a wireless device tries to connect to the Basic Service Set (BSS).
Several BSSs can be joined together to form one logical WLAN
segment, referred to as an extended service set (ESS). The SSID is used
to identify the ESS.
In 802.11 networks, each Access Point advertises its presence several
times per second by broadcasting beacon frames that carry the ESS
name (SSID). Stations discover APs by listening for beacons, or by
sending probe frames to search for an AP with a desired SSID. When
the station locates an appropriately-named Access Point, it sends an
associate request frame containing the desired SSID. The AP replies
with an associate response frame, also containing the SSID.
Some APs can be configured to send a zero-length broadcast SSID in
beacon frames instead of sending their actual SSID. The AP must
return its actual SSID in the probe response.
Summit WM20 User Guide, Software Release 4.2
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